JP2629281B2 - Laser scanning device - Google Patents
Laser scanning deviceInfo
- Publication number
- JP2629281B2 JP2629281B2 JP63172092A JP17209288A JP2629281B2 JP 2629281 B2 JP2629281 B2 JP 2629281B2 JP 63172092 A JP63172092 A JP 63172092A JP 17209288 A JP17209288 A JP 17209288A JP 2629281 B2 JP2629281 B2 JP 2629281B2
- Authority
- JP
- Japan
- Prior art keywords
- magnification
- sos sensor
- scanning direction
- scanning
- condenser lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
- G02B26/127—Adaptive control of the scanning light beam, e.g. using the feedback from one or more detectors
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、レーザ走査光学系のSOSセンサの同期タイ
ミングの検出において、特に走査方向と直角方向の照射
ずれの発生を防止することができるレーザ走査装置に関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a laser that can prevent the occurrence of irradiation deviation, particularly in the direction perpendicular to the scanning direction, in detecting the synchronization timing of an SOS sensor of a laser scanning optical system. It relates to a scanning device.
「従来の技術」 レーザ走査装置に配置されるSOSセンサは、同期タイ
ミングの検出性能上、ビーム光が感光体上に結像する至
近位置に配置されるが、この位置にSOSセンサを配置す
ると、他のエレメントや画像用ビーム光等と干渉したり
する場合があって、配置位置にかなりの制約を受ける。`` Prior art '' The SOS sensor arranged in the laser scanning device is arranged at the closest position where the light beam forms an image on the photoconductor due to the detection performance of the synchronization timing, but if the SOS sensor is arranged at this position, It may interfere with other elements, image beam light, or the like, and the arrangement position is considerably restricted.
このためSOSセンサ用ビーム光の光路上の何ら配置上
の制約を受けない、いわゆる感光体等価位置にSOSセン
サを配置したり、或いは該等価位置に越えた位置に、SO
Sセンサを配置するとともに集光レンズを配置して、等
価位置とSOSセンサが共役関係になるようにした提案
は、例えば特開昭54−140548号により提案されている。For this reason, there is no restriction on the arrangement of the SOS sensor beam light on the optical path, and the SOS sensor is arranged at a so-called photosensitive member equivalent position, or the SOS sensor is located at a position beyond the equivalent position.
A proposal in which an S sensor is disposed and a condenser lens is disposed so that the equivalent position and the SOS sensor have a conjugate relationship is proposed in, for example, Japanese Patent Application Laid-Open No. 54548/1979.
この提案の主な目的は、SOSセンサの同期タイミング
の検出精度を高め、検出作動の信頼性を高めて、タイミ
ング検出装置の実用性を向上させることであって、その
実施例中に集光レンズの倍率を高めることにより、SOS
センサ受光面を走査するビームの振れ速度が、倍率と比
例的に増大して前記検出精度を一層高め得るとしてい
る。これは、SOSセンサへの走査光の走査速度を早くし
ておけば、相対的にSOSセンサの出力の立上がり時間を
早くして、同期タイミングのずれを少なくすることがで
きることによる（特開昭54−140558号参照）。The main purpose of this proposal is to improve the detection accuracy of the synchronization timing of the SOS sensor, improve the reliability of the detection operation, and improve the practicality of the timing detection device. SOS by increasing the magnification of
It is stated that the deflection speed of the beam that scans the light receiving surface of the sensor increases in proportion to the magnification, and the detection accuracy can be further improved. This is because if the scanning speed of the scanning light to the SOS sensor is increased, the rise time of the output of the SOS sensor can be relatively shortened and the deviation of the synchronization timing can be reduced. -140558).
「発明が解決しようとする課題」 しかしながら、前記はビーム光量を多くしたり又は、
SOSセンサの感度を高感度にする必要がある。またポリ
ゴンミラーで偏向されたビーム光が集光する結像点は、
ポリゴンミラーの面倒れ、及びポリゴンミラーを含む光
学系を構成するエレメント等の取付誤差により、走査方
向と直角方向にずれる場合がある。前記の様に集光レン
ズの倍率を１より大きくすると、第４図に示すように上
下方向のずれ量δは、SOSセンサＳの受光面ではδ′＝b
/a・δと拡大されて、該受光面から外れビームの検出不
良を生ずる場合もあって、SOSセンサの検出精度を高め
るため一概に集光レンズの倍率を大きくするわけにはい
かない等の問題点がある。"Problems to be solved by the invention" However, the above-mentioned increases the beam light amount or
It is necessary to increase the sensitivity of the SOS sensor. The image point where the beam light deflected by the polygon mirror is focused is
There is a case where the polygon mirror is deviated in the direction perpendicular to the scanning direction due to the inclination of the surface of the polygon mirror and mounting errors of elements constituting the optical system including the polygon mirror. When the magnification of the condenser lens is larger than 1, as described above, the vertical shift amount δ is δ ′ = b on the light receiving surface of the SOS sensor S as shown in FIG.
In some cases, it is enlarged to / a · δ, and the beam deviating from the light receiving surface may cause detection failure.Therefore, it is not possible to increase the magnification of the condenser lens in order to increase the detection accuracy of the SOS sensor. There is a point.
本発明は、前記問題点を解決することを課題とするも
のであって、SOSセンサの同期タイミングの検出におい
て、特に走査方向と直角方向の照射ずれの発生を防止す
ることができるレーザ走査装置を提供することを目的と
する。The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a laser scanning apparatus capable of preventing the occurrence of irradiation deviation in a direction perpendicular to a scanning direction, particularly in detection of synchronization timing of an SOS sensor. The purpose is to provide.
「課題を解決するための具体的手段」 前記目的を達成するため請求項１の発明は、画信号に
より変調されたレーザビームを所定の走査方向に偏向し
て、被走査面上を走査させるための偏向手段と、前記画
信号によるレーザビームの変調と前記走査との同期を取
るため、前記偏向手段により偏向されたレーザビームの
光路上に配置された集光レンズ及びSOSセンサとを備
え、前記集光レンズ及びSOSセンサは、前記偏向手段に
より偏向されたレーザビームの集光点と前記SOSセンサ
の受光面とが共役関係になるように配置されていると共
に、前記共役関係において少なくとも走査方向に垂直な
方向の倍率が１より小さくなるように前記集光レンズを
位置させたことを特徴とする。In order to achieve the above object, an invention according to claim 1 is to deflect a laser beam modulated by an image signal in a predetermined scanning direction to scan on a surface to be scanned. Deflecting means, and a condenser lens and an SOS sensor disposed on the optical path of the laser beam deflected by the deflecting means to synchronize the modulation of the laser beam with the image signal and the scanning, and The condenser lens and the SOS sensor are arranged so that the focal point of the laser beam deflected by the deflecting unit and the light receiving surface of the SOS sensor have a conjugate relationship, and at least in the scanning direction in the conjugate relationship. The condenser lens is positioned so that the magnification in the vertical direction is smaller than 1.
請求項２の発明は、前記集光レンズは、走査方向のみ
倍率が可変である第１集光レンズと、走査方向に垂直な
方向のみ倍率が可変である第２集光レンズとを有し、前
記第１集光レンズは倍率が１より大きくなる位置に、前
記第２集光レンズは倍率が１より小さくなる位置に、そ
れぞれ位置させたことを特徴とする。The invention according to claim 2, wherein the condenser lens has a first condenser lens whose magnification is variable only in a scanning direction, and a second condenser lens whose magnification is variable only in a direction perpendicular to the scanning direction, The first condenser lens is located at a position where the magnification is larger than 1, and the second condenser lens is located at a position where the magnification is smaller than 1.
請求項３の発明は、レーザビームで被走査面上を所定
の走査方向に走査させるレーザ走査装置において、前記
被走査面と等価な所定位置を越えた位置に配置され、前
記レーザビームを受光し、レーザビームの変調開始のた
めの同期信号を出力するSOSセンサと、前記所定位置と
前記SOSセンサとの間に、それらが共役関係になるよう
に配置され、走査方向に垂直な方向に１より小さい倍率
を呈する集光レンズと、を備えたことを特徴とする。According to a third aspect of the present invention, in a laser scanning device that scans a surface to be scanned with a laser beam in a predetermined scanning direction, the laser scanning device is disposed at a position beyond a predetermined position equivalent to the surface to be scanned, and receives the laser beam. A SOS sensor that outputs a synchronization signal for starting modulation of a laser beam, and the SOS sensor, the predetermined position and the SOS sensor are arranged so that they are in a conjugate relationship, and are arranged in a direction perpendicular to the scanning direction. And a condenser lens having a small magnification.
請求項４の発明は、請求項３の集光レンズが、走査方
向のみ屈折力を有する第１集光レンズと、走査方向に垂
直な方向のみ屈折力を有する第２集光レンズとを有し、
前記第１集光レンズは走査方向の倍率が１より大きくな
る位置に、前記第２集光レンズは走査方向に垂直な方向
の倍率が１より小さくなる位置に、それぞれ位置させた
ことを特徴とする。According to a fourth aspect of the present invention, the condenser lens of the third aspect has a first condenser lens having a refractive power only in the scanning direction and a second condenser lens having a refractive power only in a direction perpendicular to the scanning direction. ,
The first condenser lens is located at a position where the magnification in the scanning direction is greater than 1, and the second condenser lens is located at a position where the magnification in the direction perpendicular to the scanning direction is less than 1. I do.
「作用」 請求項1,3の発明によると、偏向されたレーザビーム
の集光点が走査方向に垂直な方向にずれても、SOSセン
サの受光面でのずれ量は集光レンズによって縮小される
ので、レーザビームがSOSセンサの受光面を外れること
が防止される。According to the first and third aspects of the invention, even if the focal point of the deflected laser beam is displaced in a direction perpendicular to the scanning direction, the amount of displacement on the light receiving surface of the SOS sensor is reduced by the condenser lens. Therefore, the laser beam is prevented from coming off the light receiving surface of the SOS sensor.
また、請求項2,4の発明によると、第２集光レンズに
より、レーザビームがSOSセンサの受光面を外れること
が防止されると共に、第１集光レンズによりSOSセンサ
を走査するレーザビームの走査速度が大きくなる。According to the second and fourth aspects of the present invention, the second condenser lens prevents the laser beam from departing from the light receiving surface of the SOS sensor, and the first condenser lens scans the SOS sensor. The scanning speed increases.
「実施例」 本発明の実施例を添付図面に基づいて説明する。"Example" An example of the present invention will be described with reference to the accompanying drawings.
第１図はレーザ走査装置の概略平面図であって、レー
ザ発振器１から発振されるレーザビーム光を光変調器2,
コリメータレンズ３及びシリンドリカルレンズ４を介し
て、等速回転駆動されるポリゴンミラー５により偏向
し、ｆθレンズ６によりその偏向ビーム光ｘを反射ミラ
ー７で感光体８の表面上に反射させるとともに、該ビー
ム光を等速走査する。FIG. 1 is a schematic plan view of a laser scanning device, in which a laser beam emitted from a laser
The light is deflected by a polygon mirror 5 driven at a constant speed via a collimator lens 3 and a cylindrical lens 4, and the deflected beam light x is reflected by a fθ lens 6 on a surface of a photoreceptor 8 by a reflection mirror 7. The light beam is scanned at a constant speed.
９は同期ビーム用ミラーであって、同期ビーム光ｙを
反射してSOSセンサ10の受光面に照射する。同期ビーム
光ｙの光路上のＡ点は、反射ミラー７で反射される偏向
ビーム光ｘの感光体８面上の結像点までの光路長と等し
い点であって、いわゆる感光体等価位置である。A synchronization beam mirror 9 reflects the synchronization beam light y and irradiates the light receiving surface of the SOS sensor 10. Point A on the optical path of the synchronous light beam y is a point equal to the optical path length of the deflected light beam x reflected by the reflection mirror 7 to the image forming point on the surface of the photosensitive member 8, and is a so-called photosensitive member equivalent position. is there.
11,12は、Ａ点とSOSセンサ10とが共役関係となるよう
に両者の間に配置した第１集光レンズと第２集光レンズ
であり、それぞれシリンドリカルレンズであって、第１
集光レンズ11は走査方向のみ倍率を可変とし、その倍率
を１より大きくなる位置に、第２集光レンズ12は走査方
向と直角な方向のみ倍率を可変とし、その倍率を１より
小さくなる位置に位置させる。Numerals 11 and 12 denote a first condenser lens and a second condenser lens disposed between the point A and the SOS sensor 10 so as to be in a conjugate relationship. The first and second condenser lenses are cylindrical lenses, respectively.
The condenser lens 11 has a variable magnification only in the scanning direction, and the second condenser lens 12 has a variable magnification only in a direction perpendicular to the scanning direction and has a magnification smaller than 1 at a position where the magnification is larger than 1. Position.
画信号によるレーザビーム光の光変調開始と、感光体
８面上への走査開始の同期のタイミングは、SOSセンサ1
0が同期ビーム光ｙを受光し、同期信号を前記光変調器
２へ出力することによりとられている。The timing of synchronizing the start of light modulation of the laser beam by the image signal and the start of scanning on the surface of the photoconductor 8 is determined by the SOS sensor
0 is received by receiving the synchronization light beam y and outputting a synchronization signal to the optical modulator 2.
第２図及び第３図により本発明に係る装置の第1,第２
集光レンズ11,12の作用を説明する。FIGS. 2 and 3 show the first and second embodiments of the device according to the present invention.
The operation of the condenser lenses 11, 12 will be described.
第２図に示す走査方向においては、同期ビーム光ｙ
は、ポリゴンミラー５の回転により、該ビーム光ｙの集
光点（Ａ点）である感光体等価位置上を走査方向に速度
ｖで移動するとともに、第１集光レンズ11により再度集
光されてSOSセンサ10の受光面を、走査方向とは逆方向
に速度ｖ′で走査する。この走査方向に対して、第２集
光レンズ11は何ら作用しない。また第１集光レンズ11の
配置位置を、同図に示すようにＡ点からam、SOSセンサ1
0までの距離をbmとし、bm/am＞１とすればｖ＜ｖ′とな
り、感光体８面上での走査速度よりも、SOSセンサ10の
感光面上での走査速度が早まって、相対的にSOSセンサ1
0の同期信号の立上がり時間を早くして同期タイミング
のずれを少なくし、その精度を高めることができる。In the scanning direction shown in FIG.
Is moved at a speed v in the scanning direction on the photosensitive member equivalent position, which is the converging point (point A) of the light beam y, by the rotation of the polygon mirror 5, and is condensed again by the first condensing lens 11. Thus, the light receiving surface of the SOS sensor 10 is scanned at a speed v 'in a direction opposite to the scanning direction. The second condenser lens 11 has no effect on this scanning direction. Further, the position of the first condenser lens 11 is set at a m from the point A as shown in FIG.
If the distance to 0 is b m and b m / a m > 1, v <v ′, and the scanning speed on the photosensitive surface of the SOS sensor 10 is faster than the scanning speed on the photosensitive member 8 surface. And relatively SOS sensor 1
The rise time of the synchronization signal of 0 can be shortened to reduce the deviation of the synchronization timing, and the accuracy can be improved.
また第３図に示す走査方向と直角な方向においては、
前記Ａ点に集光する同期ビーム光ｙが前記したポリゴン
ミラーの面倒れや光学系の取付誤差等によりδだけ上方
にずれた場合には、第２集光レンズ12に再度集光されSO
Sセンサ10の受光面をδ′分下方にずれた位置に照射す
る。この場合、第１集光レンズ11は何ら同期ビーム光ｙ
には作用しない。第２集光レンズ12の配置位置を、同図
に示すようにＡ点からの距離をas、SOSセンサ10までの
距離をbsとし、as/bs＞１とすればδ＞δ′となり同期
ビーム光ｙの照射位置ずれがSOSセンサ10の受光面で縮
小される。従って第２集光レンズ12がない場合には、同
期ビーム光ｙがSOSセンサ10の受光面から外れてしまう
いわゆるビームの検出不良を防ぐことができる。In the direction perpendicular to the scanning direction shown in FIG. 3,
When the synchronous beam light y condensed at the point A is shifted upward by δ due to the surface tilt of the polygon mirror or the mounting error of the optical system, the light is condensed again by the second condenser lens 12 and the
The light is irradiated on the light receiving surface of the S sensor 10 at a position shifted downward by δ '. In this case, the first condenser lens 11 does not emit any synchronous light beam y
Does not work. As shown in the drawing, if the arrangement position of the second condenser lens 12 is a s from the point A, b s the distance to the SOS sensor 10, and if a s / b s > 1, δ> δ ′, And the irradiation position shift of the synchronous beam light y is reduced on the light receiving surface of the SOS sensor 10. Therefore, when the second condenser lens 12 is not provided, it is possible to prevent a so-called beam detection defect in which the synchronous beam light y deviates from the light receiving surface of the SOS sensor 10.
また、走査方向の同期ずれが、第１集光レンズ11を廃
止しても、或いは倍率を１以上にしないでも許容できる
場合には、第２集光レンズ12のみを用い、或いは該レン
ズ12を走査方向と直角方向以外にも倍率を可変とする通
常の集光レンズとすることもできる。この場合、SOSセ
ンサ10の受光面に対する同期ビーム光の走査速度が、感
光体８面上での走査速度より早くならないため、低感度
のSOSセンサを用いることができる。Further, if the synchronization deviation in the scanning direction can be tolerated even if the first condenser lens 11 is abolished or the magnification is not increased to 1 or more, only the second condenser lens 12 is used or the lens 12 is used. An ordinary condensing lens that can change the magnification in addition to the direction perpendicular to the scanning direction can also be used. In this case, since the scanning speed of the synchronous light beam on the light receiving surface of the SOS sensor 10 does not become faster than the scanning speed on the surface of the photoconductor 8, a low-sensitivity SOS sensor can be used.
「発明の効果」 請求項1,3の発明によると、レーザビームの集光点
（被走査面と等価な位置）とSOSセンサとが共役関係に
なるように集光レンズが配置されると共に、その集光レ
ンズは走査方向に垂直な方向の倍率が１より小さくなる
ように位置している。これにより、レーザビームの集光
点が走査方向に垂直な方向にずれてもSOSセンサの受光
面でのずれ量は集光レンズによって縮小されるので、SO
Sセンサの受光面からレーザビームが外れることがな
い。従って、SOSセンサが検出不良を生じ、SOSセンサが
同期信号を出力できなくなることが防止される。また、
SOSセンサを小型化することが可能になる。According to the first and third aspects of the invention, the condenser lens is arranged so that the focal point of the laser beam (a position equivalent to the surface to be scanned) and the SOS sensor have a conjugate relationship. The condenser lens is positioned so that the magnification in the direction perpendicular to the scanning direction is smaller than 1. As a result, even if the focal point of the laser beam is displaced in a direction perpendicular to the scanning direction, the amount of displacement on the light receiving surface of the SOS sensor is reduced by the condenser lens.
The laser beam does not deviate from the light receiving surface of the S sensor. Therefore, it is possible to prevent the SOS sensor from causing a detection failure and preventing the SOS sensor from outputting a synchronization signal. Also,
It is possible to reduce the size of the SOS sensor.
更に、請求項2,4の発明によると、第１集光レンズに
より、SOSセンサを走査するレーザビームの走査速度が
大きくなるので、同期タイミングの検出精度を高め得る
という効果も奏する。Furthermore, according to the second and fourth aspects of the present invention, since the scanning speed of the laser beam for scanning the SOS sensor is increased by the first condenser lens, there is an effect that the detection accuracy of the synchronization timing can be improved.
添付図面は、本発明の実施例を示し、第１図は本発明装
置の概略平面図、第２図は第１集光レンズ11の作用を、
第３図は第２集光レンズ12の作用を説明する説明図、第
４図は照射ビーム光の照射ずれによるSOSセンサのビー
ムの検出不良を説明した説明図である。 ２……光変調器、５……ポリゴンミラー、６……ｆθレ
ンズ、10……SOSセンサ、11……第１集光レンズ、12…
…第２集光レンズ、ｘ……偏向ビーム光、ｙ……同期ビ
ーム光。The accompanying drawings show an embodiment of the present invention. FIG. 1 is a schematic plan view of the device of the present invention, and FIG.
FIG. 3 is an explanatory diagram for explaining the operation of the second condenser lens 12, and FIG. 4 is an explanatory diagram for explaining a beam detection failure of the SOS sensor due to irradiation deviation of the irradiation light beam. 2 ... optical modulator, 5 ... polygon mirror, 6 ... fθ lens, 10 ... SOS sensor, 11 ... first condenser lens, 12 ...
... A second condenser lens, x... A deflected beam light, y... A synchronous beam light.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小島 弘明 大阪府大阪市東区安土町２丁目30番地 大阪国際ビル ミノルタカメラ株式会社 内 (72)発明者 山田 幸夫 大阪府大阪市東区安土町２丁目30番地 大阪国際ビル ミノルタカメラ株式会社 内 審査官 津田 俊明 (56)参考文献 特開 昭62−75612（ＪＰ，Ａ) 特開 昭63−98624（ＪＰ，Ａ) 特開 平１−128033（ＪＰ，Ａ) 特開 昭63−173010（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroaki Kojima 2-30, Azuchi-cho, Higashi-ku, Osaka-shi, Osaka Inside Osaka International Building Minolta Camera Co., Ltd. (72) Yukio Yamada 2--30, Azuchi-cho, Higashi-ku, Osaka, Osaka Address Osaka International Building Minolta Camera Co., Ltd. Examiner Toshiaki Tsuda (56) References JP-A-62-75612 (JP, A) JP-A-63-98624 (JP, A) JP-A-1-128033 (JP, A) ) JP-A-63-173010 (JP, A)
Claims (4)
定の走査方向に偏向して、被走査面上を走査させるため
の偏向手段と、 前記画信号によるレーザビームの変調と前記走査との同
期を取るため、前記偏向手段により偏向されたレーザビ
ームの光路上に配置された集光レンズ及びSOSセンサと
を備え、 前記集光レンズ及びSOSセンサは、前記偏向手段により
偏向されたレーザビームの集光点と前記SOSセンサの受
光面とが共役関係になるように配置されていると共に、 前記共役関係において少なくとも走査方向に垂直な方向
の倍率が１より小さくなるように前記集光レンズを位置
させたことを特徴とするレーザ走査装置。1. A deflection means for deflecting a laser beam modulated by an image signal in a predetermined scanning direction to scan on a surface to be scanned, and synchronizing the modulation of the laser beam by the image signal with the scanning. A focusing lens and an SOS sensor arranged on the optical path of the laser beam deflected by the deflecting means, wherein the focusing lens and the SOS sensor collect the laser beam deflected by the deflecting means. The light spot and the light receiving surface of the SOS sensor are arranged so as to have a conjugate relationship, and the condensing lens is positioned such that the magnification in at least a direction perpendicular to the scanning direction in the conjugate relationship is smaller than 1. A laser scanning device.
変である第１集光レンズと、走査方向に垂直な方向のみ
倍率が可変である第２集光レンズとを有し、前記第１集
光レンズは倍率が１より大きくなる位置に、前記第２集
光レンズは倍率が１より小さくなる位置に、それぞれ位
置させたことを特徴とする請求項１記載のレーザ走査装
置。2. The condensing lens has a first condensing lens whose magnification is variable only in a scanning direction, and a second condensing lens whose magnification is variable only in a direction perpendicular to the scanning direction. 2. The laser scanning device according to claim 1, wherein the one condenser lens is located at a position where the magnification is greater than 1, and the second condenser lens is located at a position where the magnification is smaller than one.
向に走査させるレーザ走査装置において、 前記被走査面と等価な所定位置を越えた位置に配置さ
れ、前記レーザビームを受光し、レーザビームの変調開
始のための同期信号を出力するSOSセンサと、 前記所定位置と前記SOSセンサとの間に、それらが共役
関係になるように配置され、走査方向に垂直な方向に１
より小さい倍率を呈する集光レンズと、 を備えたことを特徴とするレーザ走査装置。3. A laser scanning device for scanning a surface to be scanned with a laser beam in a predetermined scanning direction, wherein the laser scanning device is disposed at a position beyond a predetermined position equivalent to the surface to be scanned, and receives the laser beam. An SOS sensor that outputs a synchronizing signal for starting modulation of a beam, and the SOS sensor is arranged between the predetermined position and the SOS sensor so that they are in a conjugate relationship.
A condensing lens having a smaller magnification, and a laser scanning device.
有する第１集光レンズと、走査方向に垂直な方向のみ屈
折力を有する第２集光レンズとを有し、前記第１集光レ
ンズは走査方向の倍率が１より大きくなる位置に、前記
第２集光レンズは走査方向に垂直な方向の倍率が１より
小さくなる位置に、それぞれ位置させたことを特徴とす
る請求項１記載のレーザ走査装置。4. The condensing lens has a first condensing lens having a refractive power only in the scanning direction and a second condensing lens having a refractive power only in a direction perpendicular to the scanning direction. 2. The optical system according to claim 1, wherein the optical lens is located at a position where the magnification in the scanning direction is greater than 1, and the second condenser lens is located at a position where the magnification in the direction perpendicular to the scanning direction is less than 1. The laser scanning device according to claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63172092A JP2629281B2 (en) | 1988-07-11 | 1988-07-11 | Laser scanning device |
| US07/376,826 US4978977A (en) | 1988-07-11 | 1989-07-07 | Laser scanner with conjugate condition lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63172092A JP2629281B2 (en) | 1988-07-11 | 1988-07-11 | Laser scanning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0222616A JPH0222616A (en) | 1990-01-25 |
| JP2629281B2 true JP2629281B2 (en) | 1997-07-09 |
Family
ID=15935394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63172092A Expired - Lifetime JP2629281B2 (en) | 1988-07-11 | 1988-07-11 | Laser scanning device |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4978977A (en) |
| JP (1) | JP2629281B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5187606A (en) * | 1989-10-20 | 1993-02-16 | Canon Kabushiki Kaisha | Scanning optical apparatus |
| US5134511A (en) * | 1989-12-08 | 1992-07-28 | Kabushiki Kaisha Toshiba | Optical unit for use in laser beam printer or the like |
| JP2964629B2 (en) * | 1990-11-22 | 1999-10-18 | ミノルタ株式会社 | Laser beam scanning optical device |
| JPH05215981A (en) * | 1992-02-05 | 1993-08-27 | Fuji Photo Optical Co Ltd | Optical scanning device |
| JP2830670B2 (en) * | 1992-12-29 | 1998-12-02 | キヤノン株式会社 | Optical scanning device |
| GB2274937B (en) * | 1993-01-23 | 1996-11-13 | Nippon Sheet Glass Co Ltd | Liquid crystal display |
| JP2000330050A (en) * | 1999-03-12 | 2000-11-30 | Canon Inc | Multi-beam scanning optical device and color image forming device |
| JP3667205B2 (en) * | 1999-07-30 | 2005-07-06 | キヤノン株式会社 | Image forming apparatus |
| KR100445120B1 (en) * | 2002-06-20 | 2004-08-21 | 삼성전자주식회사 | apparatus for detecting a synchronizing signal |
| JP2012118214A (en) | 2010-11-30 | 2012-06-21 | Kyocera Document Solutions Inc | Optical scanner and image forming apparatus |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4084197A (en) * | 1975-10-23 | 1978-04-11 | Xerox Corporation | Flying spot scanner with scan detection |
| JPS54140558A (en) * | 1978-04-24 | 1979-10-31 | Ricoh Co Ltd | Beam position detecting device for recorder |
| JPS54140548A (en) * | 1978-04-24 | 1979-10-31 | Ricoh Co Ltd | Detector for scanning timing |
| US4731623A (en) * | 1985-09-30 | 1988-03-15 | Kabushiki Kaisha Toshiba | Image formation device |
| US4733307A (en) * | 1985-10-01 | 1988-03-22 | Fuji Photo Film Co., Ltd. | Light beam recording apparatus, light beam read-out apparatus and light beam scanning apparatus |
-
1988
- 1988-07-11 JP JP63172092A patent/JP2629281B2/en not_active Expired - Lifetime
-
1989
- 1989-07-07 US US07/376,826 patent/US4978977A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4978977A (en) | 1990-12-18 |
| JPH0222616A (en) | 1990-01-25 |
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